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106 lines
3.0 KiB
106 lines
3.0 KiB
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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Shader "Hidden/TonemappingColorGradingHistogram"
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{
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SubShader
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{
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ZTest Always Cull Off ZWrite Off
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Fog { Mode off }
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CGINCLUDE
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#pragma fragmentoption ARB_precision_hint_fastest
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#pragma target 5.0
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#include "UnityCG.cginc"
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struct v_data
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{
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float4 pos : SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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StructuredBuffer<uint4> _Histogram;
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float2 _Size;
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uint _Channel;
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float4 _ColorR;
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float4 _ColorG;
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float4 _ColorB;
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float4 _ColorL;
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v_data vert(appdata_img v)
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{
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v_data o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = v.texcoord;
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return o;
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}
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float4 frag_channel(v_data i) : SV_Target
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{
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const float4 COLORS[4] = { _ColorR, _ColorG, _ColorB, _ColorL };
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float remapI = i.uv.x * 255.0;
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uint index = floor(remapI);
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float delta = frac(remapI);
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float v1 = _Histogram[index][_Channel];
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float v2 = _Histogram[min(index + 1, 255)][_Channel];
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float h = v1 * (1.0 - delta) + v2 * delta;
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uint y = (uint)round(i.uv.y * _Size.y);
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float4 color = float4(0.0, 0.0, 0.0, 0.0);
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float fill = step(y, h);
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color = lerp(color, COLORS[_Channel], fill);
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return color;
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}
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float4 frag_rgb(v_data i) : SV_Target
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{
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const float4 COLORS[3] = { _ColorR, _ColorG, _ColorB };
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float4 targetColor = float4(0.0, 0.0, 0.0, 0.0);
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float4 emptyColor = float4(0.0, 0.0, 0.0, 0.0);
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float fill = 0;
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for (int j = 0; j < 3; j++)
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{
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float remapI = i.uv.x * 255.0;
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uint index = floor(remapI);
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float delta = frac(remapI);
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float v1 = _Histogram[index][j];
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float v2 = _Histogram[min(index + 1, 255)][j];
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float h = v1 * (1.0 - delta) + v2 * delta;
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uint y = (uint)round(i.uv.y * _Size.y);
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float fill = step(y, h);
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float4 color = lerp(emptyColor, COLORS[j], fill);
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targetColor += color;
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}
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return saturate(targetColor);
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}
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ENDCG
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// (0) Channel
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag_channel
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ENDCG
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}
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// (1) RGB
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag_rgb
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ENDCG
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}
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}
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FallBack off
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}
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